nan, nanf, nanl
From cppreference.com
| Defined in header <math.h>
|
||
| float nanf( const char* arg ); |
(since C99) | |
| double nan( const char* arg ); |
(since C99) | |
| long double nanl( const char* arg ); |
(since C99) | |
Converts the implementation-defined character string arg into the corresponding quiet NaN value. The call std::nan("string") is equivalent to the call std::strtod("NAN(string)", (char**)NULL);.
Contents |
[edit] Parameters
| arg | - | narrow character string identifying the contents of a NaN, or an empty string |
[edit] Return value
The NaN value that corresponds to the identifying string arg or zero if the implementation does not support quiet NaNs.
[edit] Example
Run this code
#include <stdio.h> #include <math.h> int main() { printf ("nan(\"\") = %f\n", nan("")); return 0; }
Possible output:
nan("") = nan[edit] See also
| (C99) |
checks if the given number is NaN (function) |
| C++ documentation for nanf, nan, nand
| |
